search for poisson-blending opencv and [Seamless Cloning](http://docs.opencv.org/3.0-beta/modules/photo/doc/cloning.html) I think it might be able to help.
search for poisson-blending opencv and [Seamless Cloning](http://docs.opencv.org/3.0-beta/modules/photo/doc/cloning.html)Seamless Cloning I think it might be able to help.